How do I have multiple AI that follow the player but don't move into each other?

I am creating a top down 2D game that uses a AI system so my enemies (skeletons) follow the player. I already have the code set up to follow the player, and it does so successfully, but the AI ignores all collision except for the player. The skeletons have a "IsTrigger" on their circle colliders, because my code to hurt the player upon trigger enter requires that so they don't move the player around. But if I have multiple skeletons at the same time, they will eventually move inside of each other. I have tried putting a box collider inside of the circle collider.

AI Code:

  public GameObject EnemyDeathParticle; 
 public LevelManager levelManager; 

 public Transform skeleton; 

 public Transform target;//set target from inspector instead of looking in Update
 public float speed = 3f;


 void Start () {
  

 }

 void Update(){

     //rotate to look at the player
     transform.eulerAngles = new Vector3 (0, 0, -transform.eulerAngles.z); 
     transform.LookAt(target.position);
     transform.Rotate(new Vector3(0,-90,0),Space.Self);//correcting the original rotation


     //move towards the player
     if (Vector3.Distance (transform.position, target.position) > 0.4f) {//move if distance from target is greater than 1
         transform.Translate (new Vector3 (speed * Time.deltaTime, 0, 0));
          
     }
         

 }

}

Skeleton Attack Code:

     public float timeBetweenAttacks = 0.5f;     // The time in seconds between each attack.
     public int attackDamage = 10;               // The amount of health taken away per attack.
 
 
     Animator anim;                              // Reference to the animator component.
      GameObject player;                          // Reference to the player GameObject.
     GameObject skeleton; 
     PlayerHealth playerHealth;                  // Reference to the player's health.
      AI enemyHealth;                    // Reference to this enemy's health.
     bool playerInRange;                         // Whether player is within the trigger collider and can be attacked.
     float timer;                                // Timer for counting up to the next attack.
 
 
     void Awake ()
     {
         // Setting up the references.
         player = GameObject.FindGameObjectWithTag ("Player");
         skeleton = GameObject.FindGameObjectWithTag ("Skeleton"); 
         playerHealth = player.GetComponent <PlayerHealth> ();
         enemyHealth = skeleton.GetComponent<AI>();
         anim = GetComponent <Animator> ();
     }
 
 
     void OnTriggerEnter2D (Collider2D other)
     {
         // If the entering collider is the player...
         if(other.gameObject == player)
         {
             // ... the player is in range.
             playerInRange = true;
         }
 
         if (other.gameObject == skeleton) {
 
 
         }
     }
 
 
     void OnTriggerExit2D (Collider2D other)
     {
         // If the exiting collider is the player...
         if(other.gameObject == player)
         {
             // ... the player is no longer in range.
             playerInRange = false;
         }
 
         if (other.gameObject == skeleton) {
 
 
         }
     }
 
 
     void Update ()
     {
         // Add the time since Update was last called to the timer.
         timer += Time.deltaTime;
 
         // If the timer exceeds the time between attacks, the player is in range and this enemy is alive...
         if(timer >= timeBetweenAttacks && playerInRange) //&& enemyHealth.currentHealth > 0
         {
             // ... attack.
             Attack ();
         }
 
         // If the player has zero or less health...
         if(playerHealth.CurrentHealth <= 0)
         {
             // ... tell the animator the player is dead.
             anim.SetTrigger ("PlayerDeath");
         }
     }
 
 
     void Attack ()
     {
         // Reset the timer.
         timer = 0f;
 
         // If the player has health to lose...
         if(playerHealth.CurrentHealth > 0)
         {
             // ... damage the player.
             playerHealth.HurtPlayer (attackDamage);
         }
     }
 }